Compatible with Switch Control found in iOS 7 or later, it can be used with up to four switches at a time via 3.5mm switch jacks.

Please note that Hook+ is not compatible with apps that use keystrokes for switch clicks. Hook+ uses the Apple Assistive Switch Control protocol for switch clicks and is compatible with Switch Control found in iOS 7 or later.

Hook+ does not have an internal battery so can be used as long as your iOS device has a battery charge